Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B12 136 found under Switch Rotary by Espey Mfg And Electronics Corp. The National Stock Number assigned to this part is 5930003278472, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B12 136.